How to avoid panic attacks from contact with weed

I have only smoked weed once, and have been scared to death of weed ever since from experiencing a terrible trip. Since then, I was once in a room full of people smoking pot, and I experienced the same thing just from being surrounded by the smoke. I do not, and never have, been constant friends with pot smokers. This was in the beginning of high school, and it was at a couple big parties. since those couple times, I have no longer put myself in those situations and with those people. The problem is, later this month I will be attending a concert to see a band I have always wanted to see, but their fans are typically heavily associated with drugs, so I am sure there will be a ton throughout the concert. Is there anything I can do to block the smoke from entering my system? Like breathing through my sweatshirt sleeve when i smell it or something to that effect? I am nervous that I will experience another freakout like in the past (which I NEVER want to have again obviously) from smelling and being around the stuff. Any ideas? Thanks!

[plaguedwanxiety]

You have anxiety and the weed is the trigger. The second hand smoke will only trigger it if you're thinking about it. Like how you are, worried about the future. "I am nervous that I will experience another freakout like in the past "
You need to address this illness with your doctor.

[plaguedwanxiety]

I couldn't smoke it due to my anxiety. After I was on Paxil a few weeks, I can smoke it.
It removed all anxiety from anything.

[Paxiled]

It isn't the second-hand smoke that's triggering your anxiety, it isn't strong enough a high.  More likely is you associating  it with your experience of anxiety triggered by smoking pot, which is what anxiety sufferers do -- they expect to get anxious, and so they do.